Integrated Fatigue and Vibration Design of Medical Welded Rotating Structures

Abstract

An integrated design framework combining fatigue life prediction and vibration analysis is developed for medical welded rotating structures. Residual stress fields obtained from welding simulations were coupled with harmonic vibration analysis under rotational excitation. A case study involving a welded rotating component subjected to 600 rpm operation showed that regions with high residual tensile stress also experienced amplified dynamic stress responses. Design optimization reduced combined fatigue-vibration damage by 29.7%, highlighting the necessity of joint consideration of welding and dynamic effects in medical device design.